2 * Atheros AR71xx SoC specific prom routines
4 * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
15 #include <linux/serial_reg.h>
17 #include <asm/bootinfo.h>
18 #include <asm/addrspace.h>
20 #include <asm/mach-ar71xx/ar71xx.h>
21 #include <asm/mach-ar71xx/platform.h>
25 unsigned long mach_type;
28 static int ar71xx_prom_argc __initdata;
29 static char **ar71xx_prom_argv __initdata;
30 static char **ar71xx_prom_envp __initdata;
32 static struct board_rec boards[] __initdata = {
35 .mach_type = MACH_AR71XX_RB_411,
38 .mach_type = MACH_AR71XX_RB_433,
41 .mach_type = MACH_AR71XX_RB_450,
45 static __init void routerboot_printargs(void)
49 for (i = 0; i < ar71xx_prom_argc; i++)
50 printk(KERN_DEBUG "prom: routerboot envp[%d]: %s\n",
51 i, ar71xx_prom_argv[i]);
54 static __init char *routerboot_getenv(const char *envname)
56 int len = strlen(envname);
59 for (i = 0; i < ar71xx_prom_argc; i++) {
60 char *env = ar71xx_prom_argv[i];
61 if (strncmp(envname, env, len) == 0 && (env)[len] == '=')
68 static __init char *redboot_getenv(const char *envname)
70 int len = strlen(envname);
73 for (env = ar71xx_prom_envp; *env != NULL; env++)
74 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
75 return *env + len + 1;
80 static __init unsigned long find_board_byname(char *name)
84 for (i = 0; i < ARRAY_SIZE(boards); i++)
85 if (strcmp(name, boards[i].name) == 0)
86 return boards[i].mach_type;
88 return MACH_AR71XX_GENERIC;
91 void __init prom_init(void)
96 printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
97 "fw_arg2=%08x, fw_arg3=%08x\n",
98 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
99 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
101 if ((fw_arg0 == 7) && (fw_arg2 == 0) && (fw_arg3 == 0)) {
102 /* assume RouterBOOT */
103 ar71xx_prom_argc = fw_arg0;
104 ar71xx_prom_argv = (char **)fw_arg1;
105 routerboot_printargs();
106 board = routerboot_getenv("board");
107 mac = routerboot_getenv("kmac");
110 ar71xx_prom_argc = fw_arg0;
111 ar71xx_prom_argv = (char **)fw_arg1;
112 ar71xx_prom_envp = (char **)fw_arg2;
113 mac = redboot_getenv("ethaddr");
117 mips_machtype = find_board_byname(board);
119 mips_machtype = MACH_AR71XX_GENERIC;
122 ar71xx_set_mac_base(mac);
124 ar71xx_print_cmdline();
127 void __init prom_free_prom_memory(void)
129 /* We do not have to prom memory to free */
132 #define UART_READ(r) \
133 __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
135 #define UART_WRITE(r, v) \
136 __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
138 void prom_putchar(unsigned char ch)
140 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
141 UART_WRITE(UART_TX, ch);
142 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);